Can I drink water for the night? Why?

According to the popular saying, "water can't be drunk overnight" is mainly because it contains chemicals such as zero alcohol, oxyphenol and hydroxyl hydrogen, which will lead to diarrhea and even produce carcinogen nitrite. But overnight water and fresh water contain these chemicals, which will not cause diarrhea. Diarrhea may be caused by exposure to air when boiling water is opened during storage, regardless of whether it is overnight.